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Discussion Starter · #21 ·
OK guys, let's see what happens after lowering PO4. As Defdac has already said it seems it helps. Anyway, now i'm going towards low levels (at least PO4). A year ago i had 2..5 ppm NO3 and not detectable PO4 (say 0.1 ppm max) and plants grew like crazy; no burned, stunted tips, no deformed leaves. At that time i didn't know the word "nutrient deficiency"
 

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OK guys, let's see what happens after lowering PO4. As Defdac has already said it seems it helps. Anyway, now i'm going towards low levels (at least PO4). A year ago i had 2..5 ppm NO3 and not detectable PO4 (say 0.1 ppm max) and plants grew like crazy; no burned, stunted tips, no deformed leaves.
Sure it will help.
Daily dosing of NO3, PO4, K, Mg and Trace Elements while maintaining daily water column levels of 0.1-0.25 ppm PO4, 5-10 ppm NO3, 1-10 ppm K, 1-3 ppm Mg and less CO2 will fix the problem. But it is impossible to achieve with EI.
 

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In the past when i didn't have any problems i had very low PO4 and NO3... Plants grew like crazy. After switching to high PO4 and NO3 the problems i described occured.
Were you using KNO3 and KH2PO4 to raise these levels? Maybe these pushed your K too high. I also developed the deformed leaf problem when I started dosing more regularly.
 

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Discussion Starter · #24 ·
I used commercial NPK fertilizer which consisted KH2PO4, KHCO3 and very little NH4. I estimated i had dosed about 1.5 ppm K daily. I didn't know what the exact K level was in the water column but i think it was about 10..15 ppm. I emphasize that the strange thing was that despite low Ca (about 13 ppm) and "decent K", i didn't have issues with twisting, deforming etc. Plants grew faster at low PO4 and NO3 levels than they do now at high ones. I think that dosing too high PO4 we just give our plants a "painful kick" making them unable to take enough amounts of Ca (it doesn't mean i'm right but if lower PO4 helps - and i hope it will - i will no longer dose high PO4). On the whole it seems to me Edward's suggestions and PPS method are better and safer than EI.
 

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Somewhere I read a post from Tom Barr who said he no longer recommends dosing K2SO4 and said to let the only source for K come from KNO3 and KH2PO4.
 

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Discussion Starter · #26 · (Edited)
So, i see clear improvement now:

- NO deformed leaves on alternatera reineckii
- fewer burned tips on umbrosum

All things happened when i stopped to dose NO3 form Ca(NO3)2... When NO3 was 5ppm plants began to grow healthier. I didn't change K levels. It's 10 ppm all the time.
However the total growth is not too fast yet. Maybe Ca(NO3)2 is not very good source of NO3 (as i remember Edward reported he had issues with Ca(NO3)2 salt)
The strange thing is that i see higher demand for iron now; i have Fe deficiency (pale and white leaves on umbrosum, pale leaves on Blyxa japonica). I added 0,2 ppm Fe and 0,1 ppm Mn and Blyxa is recovering from the deficiency. At the same time i noticed EDTA Fe chelator is not very good.
 
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